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Microstructures and Mechanical Properties of Commercial Hot‐Extruded Copper Processed by Torsion Deformation
Author(s) -
Guo Ning,
Li Xiaoxia,
Xiao Mei,
Xin Renlong,
Chai Linjiang,
Song Bo,
Yu Hongbing,
Li Lu
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201600252
Subject(s) - materials science , torsion (gastropod) , lamellar structure , microstructure , composite material , rod , ultimate tensile strength , copper , work hardening , strain hardening exponent , metallurgy , medicine , alternative medicine , surgery , pathology
Free‐end torsion deformation is used for processing copper rod in this work. Both microstructures and mechanical properties of the torsional rods are quantitatively analyzed. The results show that gradient lamellar dislocation substructures (LDS) along the radial direction as the main defects are formed after torsion. The increment of the LDS density, the shrinking of spacing size, and the change of length/spacing (L/S) ratio of the LDS are all non‐monotonic function of torsion revolution. High‐density LDS with fine spacing can retain strain hardening capability, which results in good combination of high tensile strength and good ductility in the torsional deformed sample with large number of revolutions. The influence of torsion strain on primary twin boundaries (TBs) in the hot‐extruded rod is also discussed.